Whenever I blitz right after a vampire has failed his Bloodthirst roll but hasn't bitten the thrall next to him yet, the biting animation will play and then the game will act as if that vampire had blitzed and i can't perform the blitz I did just before the animation.
Tried to upload computer stats in a zip file, but said i don't have enough privilages

An easy to workaround though: simply don't use Blitz action to activate the next player after failed Bloodlust. Since the action itself won't happen anyway and will get cancelled (it's just being used to trigger biting animation), just move someone one square.